Mesh Deform is not effecting some bones on the hand of my character. (Rigify/Lattice problem)
This might be similar to what you're looking for; it uses the mesh deform modifier. I was having the same problem as you for a while.
Here's a video that helped: https://www.youtube.com/watch?v=AYzR4jY8wi4
Here's a little in-depth tutorial:

Grab your body (not the mesh deform) and create a Vertex Group and weight paint just the hands and feet (and maybe the head and/or groin for some people, wherever there’s unwanted movement created by mixing both the mesh deform and the parented body - as you can see I didn’t include the eyes bc I liked how the mesh deform deformed them).


Go to your modifiers and add an armature modifier and add your vertex group to the vertex group section. Do the same thing for the mesh deform, but also check the arrows button next to it (it inverses the chosen vertex group).



Hope this helps!!!